Square-pole screw

A screw and main body technology, applied in the field of square halberd screws, can solve the problems of difficulty in maintaining the stability of the fracture end, instability of the fracture end, screw loosening, etc., so as to avoid the risk of fixing the retreating screw and improve the bone healing rate.

Pending Publication Date: 2018-06-01
北京中安泰华科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When the screw is used alone, the screw achieves the purpose of fixing the fracture due to the close engagement of its thread with the bone, but as the axial dynamic load cycle increases, the screw begins to cause relaxation. If the screw loosens before the fracture heals, the fracture end will Will be unstable, resulting in delayed or failed fracture healing
Especially for fracture patients with osteoporosis, the risk of screw withdrawal is even higher
[0003] When the screw and the plate are used together, due to the increase of the axial dynamic load cycle, the screw will loosen. If the screw loosens before the fracture heals, the fracture end will not be stable, especially the metaphysis and osteoporotic bone end, which will be more difficult. maintain the stability of the fracture

Method used

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Embodiment 1

[0025] As shown in the figure, the square halberd screw provided by this embodiment includes a screw body and a fixing pin; the screw body is provided with an inner hole along the axis; the tail of the screw body is provided with an oblique hole in the axial direction; The inner holes communicate; the inner holes are provided with fixed pins matching the inner holes.

[0026] The screw body is a screw-shaped cylinder.

[0027] The inclined holes are arranged symmetrically at the tail of the screw body; the axial angle of the inclined holes is 20-25 degrees; the axial angle is the angle between the axial direction of the main body and the axis of the inclined holes.

[0028] The fixing pin is a single fixing pin, the head of the single fixing pin is provided with threads, and the tail is provided with a triangular pyramid.

[0029] The fixed needles are double fixed needles, and the heads of the double fixed needles are provided with internal threads; the tails are provided wi...

Embodiment 2

[0034] As shown in the figure, the square halberd screw provided in this embodiment is inserted into the screw body through a single fixation pin and directly screwed in without fixing by a nut to achieve the anti-retraction effect of the screw. The double fixation pins need to be loaded into the screw body with special instruments and the nuts should be tightened to achieve the anti-retraction effect of the double fixation screws. Square halberd screws for patients with osteoporotic fractures avoid the risk of fixing back screw, and improve the bone healing rate of patients with osteoporotic fractures

[0035] The square halberd screw provided in this embodiment includes a screw body 1, a fixing pin 2 and a nut 3; the screw body is provided with an inner hole, and two oblique holes are respectively made at an axial angle of 180 degrees at the tail of the screw body, and the oblique holes are aligned with the axis of the screw body. The inner holes are connected, the angle of ...

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PUM

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Abstract

The invention discloses a square-pole screw, comprising a screw body and a fixing pin; the screw body is axially provided with an inner hole; the tail of the screw body is axially provided with an oblique hole that is communicated with the inner hole; the fixing pin matched with the inner hole is arranged in the same. The square-pole screw has the advantages that the fixing pin is mounted in the screw body, screw retreating prevention can be achieved by direct screwing with no need for cap fixation; alternatively, double fixing pins are mounted in the screw body, a cap is tightened, and accordingly dual-fixing screw treating prevention can be achieved; the square-pole screw prevents the risk of screw retreating after fixation for a patient with osteoporotic fracture, and bone healing rateis increased for the patient with osteoporotic fracture.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to square halberd screws. Background technique [0002] When the screw is used alone, the screw achieves the purpose of fixing the fracture due to the close engagement of its thread with the bone, but as the axial dynamic load cycle increases, the screw begins to cause relaxation. If the screw loosens before the fracture heals, the fracture end will Will be unstable, resulting in delayed or failed fracture healing. Especially for fracture patients with osteoporosis, the risk of nail withdrawal is even higher. [0003] When the screw and the plate are used together, due to the increase of the axial dynamic load cycle, the screw will loosen. If the screw loosens before the fracture heals, the fracture end will not be stable, especially the metaphysis and osteoporotic bone end, which will be more difficult. Maintain the stability of the fractured end. Contents of the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/86
CPCA61B17/86A61B17/8685A61B2017/8655
Inventor 李东贤罗爱民赵国良
Owner 北京中安泰华科技有限公司
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